摘要:
对具有析氧抑氯选择电催化性能的海水电解制氢用绿色环保阳极材料进行了研究.采用阳极电沉积法在Ti/IrO2基体上获得γ-MnO2氧化物涂层钛电极,在镀液中掺杂其他元素进行阳极电沉积,获得了MnV、MnCr、MnMoFe和MnFeV混合氧化物涂层钛电极.模拟海水电解实验表明,掺杂元素显著提高锰氧化物涂层钛电极析氧抑氯选择电催化性能,MnFeV电极的析氧效率达到100%,可以满足析氧抑氯选择性电催化性的要求.结构分析结果表明,掺杂后的锰氧化物电极形成了具有掺杂V、Fe的γ-MnO2相结构的混合氧化物Mn(Fe,V)O2,Mn(Fe,V)O2中金属以Mn4+、V5+和Fe3+形式存在,与氧形成了非定比化合物(Mn,Fe,V)Ox.Fe和V等掺杂元素起到细化晶粒和提高晶格畸变能的作用,有效地提高了电极的析氧抑氯电催化性能.
Abstract:
Anode materials for hydrogen production by electrolyzing seawater were investigated. The electrodes with γ-MnO2 type oxide coatings were prepared by anodic electrodeposition on the base of Ti/IrO2. MnV, MnCr, MnMoFe and MnFeV electrodes were obtained by doping other elements in electrodeposition solution. The results of testing in simulated seawater indicated that the doped elements obviously enhanced the selective performance of electrodes for evolving oxygen and restraining chlorine. The oxygen evolution efficiency of MnFeV was as high as 100%, which can meet the requirement of selectivity in electrolyzing seawater. The results of structure analysis show that a mix-oxide Mn(Fe, V)O2 with γ-MnO2 structure was formed after adding Cr, Fe and V to the manganese oxide electrodes. These elements existed in Mn(Fe,V)O2 in the form of Mn4+, V5+, and Fe3+. The doped Fe and V can refine grains and increase the deformation energy, thus the electrocatalystic properties for evolving oxygen of electrodes were improved effectively.
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